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Atomic Structure and Chemical Bonding — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtomic Structure and Chemical Bonding3 Marks
Question
Explain the rule according to which electrons are filled in various energy levels.
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Answer

1. The maximum capacity of a shell to accommodate electrons is given by the general formula $2 n^2$, where $n$ is the serial number of a shell.
2. The maximum number of electrons possible in the outermost shell is $8$ and that in the penultimate shell is $18$ .
3. It is not necessary for an orbit to be completed before another is formed. In fact, a new orbit is formed when the outermost shell attains 8 electrons.

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